
The facts.
| Brand | STM |
|---|---|
| Part number | FYA-S180 |
| Type | Slipper clutch (anti-hopping clutch) |
| Fitment | Yamaha YZF-R3 (2019–2026) |
| Operating mechanism | Patented ball-ramp system |
| Spring type | Diaphragm spring |
| Weight saving | Approximately 0.7–0.8 kg reduction in rotating mass |
| Country of manufacture | Italy |
DescriptionThe whole story▼
A slipper clutch is one of the most rewarding upgrades you can make to a YZF-R3 — and the STM FYA-S180 delivers that benefit without demanding a race budget or a race schedule. Engineered specifically for the Yamaha YZF-R3 across model years 2019 to 2026, it smooths out every downshift on your favourite back road just as effectively as it does on a circuit, giving you more confidence the moment you tip into a corner.
Key Features
- Prevents engine over-rev on downshifts, keeping the rear wheel planted and the chassis composed during braking
- Reduces rear-wheel hop to deliver improved traction and stability under hard deceleration
- Significantly lowers the trigger impulse of a highside, making spirited riding meaningfully safer
- Allows controlled rear-wheel slides — a natural advantage for both track days and flowing road sessions
- Improves clutch closure control mid-corner, preventing the bike from tucking the front under load
- Diaphragm spring design smooths the feel at the lever and eliminates pressure-plate wobble for a cleaner release
- Patented ball-ramp mechanism governs the anti-hopping function with precision at high rpm
- Approximately 0.7–0.8 kg reduction in rotating mass, noticeably sharpening throttle response and overall performance
Everyday Usability
Where many slipper clutches are designed purely for the pits, the STM FYA-S180 is equally at home on a Sunday morning ride. The progressive engagement means town traffic and slow-speed manoeuvring feel natural rather than snatchy, while the weight saving keeps the YZF-R3 feeling nimble and responsive from the moment you pull away. Installation uses the existing basket architecture of the R3, so the learning curve is manageable for a competent home mechanic.
Technology & Build Quality
STM's patented ball-ramp system is the heart of the unit. Under normal throttle-on conditions the ramps lock the clutch pack in full engagement, transmitting drive cleanly. As soon as engine braking forces reverse through the drivetrain — during a rapid downshift or a missed gear — the ramps disengage proportionally, limiting the torque spike that would otherwise spin the rear tyre or snap the chassis sideways. The diaphragm spring replaces the conventional coil-spring stack, producing a more linear lever pull and removing the risk of pressure-plate flutter at sustained high rpm. Every component is manufactured to STM's exacting tolerances, reflecting decades of Italian motorsport engineering applied to a machine that punches well above its displacement.
Fitment & Compatibility
This clutch is a direct-fit replacement designed exclusively for the Yamaha YZF-R3 covering model years 2019 through 2026. No modifications to the engine cases or clutch basket are required. Always verify your specific model year against the part number FYA-S180 before ordering.
Specifications
- Brand: STM
- Part number: FYA-S180
- Type: Slipper clutch (anti-hopping clutch)
- Fitment: Yamaha YZF-R3 (2019–2026)
- Operating mechanism: Patented ball-ramp system
- Spring type: Diaphragm spring
- Weight saving: approximately 0.7–0.8 kg reduction in rotating mass
- Country of manufacture: Italy
FitmentWhich bikes this fits▼
- Yamaha YZF-R3 (2019–2026)
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